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Quizzes > Quizzes for Business > Construction

Electrician Qualification Practice Quiz

Sharpen Your Electrical Skills with This Quiz

Difficulty: Moderate
Questions: 20
Learning OutcomesStudy Material
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Ready to boost your electrician exam prep? This electrician practice quiz offers 15 engaging multiple-choice questions covering wiring, safety protocols, and code applications. Ideal for apprentices and seasoned technicians seeking certification readiness, it sharpens critical skills and boosts confidence. Feel free to tailor any question in our editor to match your study goals. For further challenges, explore the Master Electrician Licensing Practice Test or dive into general Exam Practice Quiz in our quizzes library.

Which copper wire gauge is required for a 20 A residential branch circuit?
12 AWG
14 AWG
10 AWG
8 AWG
The National Electrical Code requires 12 AWG copper conductors for circuits protected at 20 A. Smaller 14 AWG conductors are only rated for 15 A and would overheat on a 20 A breaker.
What is the primary function of a circuit breaker in a residential panel?
Protecting the circuit from overload and short circuit
Stepping down voltage to appliances
Regulating line voltage
Providing ground-fault protection
A circuit breaker interrupts current when an overload or short circuit occurs to prevent overheating and fire. It does not transform voltage or specifically provide GFCI protection.
Which personal protective equipment (PPE) item is essential to protect against electrical shock when working on live conductors?
Insulated rubber gloves
Safety glasses
Hard hat
Steel-toed boots
Insulated rubber gloves designed for electrical work prevent current from passing through the body. Other PPE items may protect against physical hazards but do not insulate against shock.
In residential wiring, what color is used to identify the grounded (neutral) conductor?
White or gray
Black
Red
Green
The NEC mandates that the grounded conductor be white or gray. Black and red are used for ungrounded (hot) conductors, and green is reserved for equipment grounding conductors.
Which device is required to protect kitchen countertop receptacles located within 6 ft of a sink?
Ground-fault circuit-interrupter (GFCI) receptacle
Arc-fault circuit-interrupter (AFCI) receptacle
Dual-function GFCI/AFCI
Grounding-type only receptacle
NEC requires GFCI protection for receptacles within 6 ft of a sink to prevent shock from ground faults. AFCI protects against arcing, not ground-fault current.
A 20 A load is supplied by a 120 V branch circuit using 60 ft of 12 AWG copper wire. What is the approximate voltage drop percentage?
3.2 %
2.5 %
4.1 %
5.0 %
Using V_d = I×R and R=1.588 Ω/1000 ft, the round-trip length is 120 ft giving V_d ≈3.8 V, which is 3.2 % of 120 V. NEC recommends keeping drop under 3 % for branch circuits.
At what ground-fault current differential will a Class A GFCI typically trip?
5 mA
10 mA
20 mA
30 mA
Class A GFCIs are designed to trip when the current difference between hot and neutral reaches approximately 5 mA. Higher thresholds do not provide required human shock protection.
According to NEC conduit fill rules, what is the maximum fill percentage for more than two conductors in a raceway?
40 %
31 %
53 %
60 %
NEC specifies a maximum of 40 % fill when installing more than two conductors in a raceway to ensure adequate heat dissipation and pulling space.
An arc-fault circuit interrupter (AFCI) is primarily designed to protect against which hazard?
Series or parallel arc faults
Ground faults
Short circuits
Overloads
AFCIs detect unintended arcing conditions in conductors and disconnect power to prevent fires. They are not intended for standard overload or ground-fault protection.
What minimum burial depth is required for 120 V residential branch-circuit cables under a driveway?
24 inches
18 inches
12 inches
6 inches
NEC Table 300.5 requires 24 inches of cover for nonmetallic-sheathed cable under vehicular traffic areas. Shallower depths are only permitted for other installations.
When installing a multiwire branch circuit, what is required for the overcurrent devices feeding the ungrounded conductors?
Common trip or handle-tied breakers
Individual unlinked breakers
GFCI breakers
Reversible breakers
MWBCs must use breakers with a common trip or handle tie so that all ungrounded conductors disconnect simultaneously, preventing potential overloading of the shared neutral.
In residential switchboxes, how many cubic inches of capacity does a 14 AWG conductor require for box fill calculations?
2.25 cu in
1.50 cu in
3.00 cu in
2.00 cu in
NEC Chapter 9, Table 1 assigns 2.25 cu in per conductor for 14 AWG. This ensures sufficient space for conductor insulation and wiring devices.
Which NEC table lists the ampacity of insulated copper conductors at 75 °C?
310.15(B)(16)
250.50
240.4
318.2
Table 310.15(B)(16) provides ampacity ratings for copper and aluminum conductors under various temperature ratings. Other tables address different topics.
A balanced three-phase, line-to-line 208 V circuit carries 30 A per phase. What is the circuit's apparent power in kVA?
10.8 kVA
6.24 kVA
7.20 kVA
12.1 kVA
Apparent power S = √3×V×I = 1.732×208 V×30 A ≈ 10,800 VA or 10.8 kVA. This calculates total three-phase kVA.
If you measure voltage on a neutral conductor under load but it disappears at no-load, what issue is most likely present?
Loose neutral connection
Open hot conductor
Ground fault to enclosure
Shorted conductor
A loose or high-resistance neutral can carry current under load, producing voltage, but when the load is removed the circuit opens and voltage drops to zero. This is a classic loose-neutral symptom.
You must size a 480 V three-phase feeder rated 100 kVA over 200 ft. Using 75 °C copper and a maximum 3 % voltage drop, which conductor is required?
4/0 AWG copper
3/0 AWG copper
2/0 AWG copper
250 kcmil copper
At 100 kVA and 480 V, I ≈120 A. Limiting drop to 14.4 V over 200 ft one-way requires about 0.321 Ω/1000 ft, matching 4/0 copper. Smaller sizes exceed the 3 % limit.
In a balanced multiwire branch circuit carrying equal currents on both hot legs, what is the neutral conductor current?
0 A
30 A
60 A
45 A
In a balanced MWBC, the neutral current is the vector sum of the phase currents. With equal and opposite phase currents, they cancel and neutral current is zero.
Which NEC article specifically covers requirements for branch circuits?
Article 210
Article 215
Article 300
Article 330
NEC Article 210 outlines the types, ratings, and requirements for branch circuits. Other articles address feeders (215), general wiring methods (300), and cables (330).
In a multiwire branch circuit, the neutral conductor must be at least what size relative to the ungrounded conductors?
The same size as the ungrounded conductors
Half the size of the ungrounded conductors
Twice the size of the ungrounded conductors
Neutral need not match size of ungrounded conductors
NEC requires that the neutral in an MWBC be the same size as the ungrounded conductors it serves to safely carry any unbalanced return current.
On a high-leg delta four-wire service, what color must the high-leg (wild leg) conductor be if the system has no grounded phase?
Orange
Blue
Brown
Red
NEC mandates the high-leg of a delta system to be identified by continuous orange coloring when no phase is grounded. Other colors are reserved for standard hot legs.
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Learning Outcomes

  1. Analyse residential and commercial wiring scenarios for code compliance
  2. Identify key electrical components and their correct applications
  3. Apply safety protocols to prevent electrical hazards effectively
  4. Demonstrate accurate circuit calculations and voltage drop assessments
  5. Evaluate troubleshooting techniques for common wiring faults
  6. Master National Electrical Code interpretations for installation standards

Cheat Sheet

  1. Understand the National Electrical Code (NEC) - Kick off your safety journey by diving into the NEC, the gold standard for safe electrical installations across the U.S. Updated every three years, it ensures you're always working with the latest safety tech and best practices. Learn more
    2. Learn more
  2. Identify Key Electrical Components - Get to know the all-stars of your electrical lineup: circuit breakers, fuses, conductors and more. Understanding how each piece works and where it fits ensures you build circuits that hum instead of blow fuses. Learn more
    3. Learn more
  3. Apply Safety Protocols - Safety first! Always install GFCIs in wet areas, wear the right PPE, and double-check your lockout/tagout procedures. Following these protocols keeps shocks, fires, and oops-moments firmly out of your toolbox. Learn more
    4. Learn more
  4. Perform Accurate Circuit Calculations - Become a circuit detective by mastering Ohm's Law (V = IR). Calculating voltage, current, and resistance accurately helps you design power systems that deliver the right juice without overloads. Learn more
    5. Learn more
  5. Evaluate Troubleshooting Techniques - Hone your problem-solving skills by diagnosing short circuits, open circuits, and ground faults. With a trusty multimeter and step-by-step fault-finding methods, you'll keep any system humming happily. Learn more
    6. Learn more
  6. Interpret NEC Installation Standards - Study NEC guidelines on conduit sizing, cable routing, and wiring methods to guarantee compliant and organized installations. Think of these rules as your blueprint for neat, safe, and audit-proof work. Learn more
    7. Learn more
  7. Understand Panelboard Requirements - Panelboards are the command center of any electrical system. Learn proper grounding, bonding, and labeling techniques so that electricity flows smoothly and safely to every branch circuit. Learn more
    8. Learn more
  8. Recognize Residential Wiring Codes - From GFCIs in bathrooms to tamper-resistant receptacles in playrooms, residential codes keep households shock-free. Spot the must-have protections that turn a regular home into a safe haven. Learn more
    9. Learn more
  9. Comprehend Commercial Wiring Standards - Commercial projects call for robust conduit systems, higher ampacity conductors, and advanced circuit protections. Master these standards to handle larger loads and stricter inspections like a pro. Learn more
    10. Learn more
  10. Stay Updated on Code Revisions - The NEC evolves to tackle new technologies and lessons learned in the field. Keep your skills sharp by following the latest revisions, attending workshops, or joining industry forums. Learn more
    11. Learn more
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